Migrate Travis CI from .org to .com

[hugovk]

https://travis-ci.org has been very slow the past few weeks because Travis CI are moving the infra over to https://travis-ci.com, and have reduced parallel workers on .org from 5 to max 4 (and it's often less).

We can still use https://travis-ci.com for open source.

We will we need to migrate by December 31st, 2020, and it'd be better to do it sooner because the .org performance is so poor.

@aclark4life Please could you migrate our repos over?

Info and instructions here:

• https://docs.travis-ci.com/user/migrate/open-source-repository-migration

I'd like to see at least these three done first:

• https://travis-ci.org/github/python-pillow/Pillow
• https://travis-ci.org/github/python-pillow/docker-images
• https://travis-ci.org/github/python-pillow/pillow-wheels

Can be done later:

• https://travis-ci.org/github/python-pillow/Sane
• https://travis-ci.org/github/python-pillow/pillow-perf

[aclark4life]

Done!

[hugovk]

Thank you!

I cancelled the remaining builds on .org which had been running/stalled for 4-5 hours:

And restarted them on .com and they're now building properly!

There's a few links to update, I'll close this once they're done.

[hugovk]

PRs created for all, closing, thanks!